Celtic-knot-basic-rectangular

One basic form of Celtic or pseudo-Celtic rectangular knotwork.

For alternative forms, see Image:Celtic-knot-basic.svg, Image:Celtic-knot-basic-linear.svg , Image:Celtic-knot-twoloops-bigends.svg , and Image:Bar-knot-basic-decorative.svg .

SVG version of Image:Celtic-knot-basic-rectangular.png

Generated by means of the following PostScript code:

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z 1.5 mul neg z .5 mul 100 165 225 arc
0 z neg 100  225 315 arc
z 1.5 mul z .5 mul 100 -45 15 arc
z 2 mul 0 100 75 135 arc
z neg z neg 100 315 225 arcn
z 1.5 mul neg z .5 mul neg 100 225 135 arcn
z neg 0 100 135 45 arcn 
z 2 mul z neg 100 225 285 arc
z 1.5 mul z 1.5 mul neg 100 -15 45 arc
0 0 100 45 135 arc
z 1.5 mul neg z 1.5 mul neg 100 135 195 arc
z 2 mul neg z neg 100 255 315 arc
z 0 100 135 45 arcn
z 1.5 mul z .5 mul neg 100 45 -45 arcn 
z z neg 100 315 225 arcn closepath y stroke grestore stroke y
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15 .5 z mul sub 15 z 2 div sub moveto -30 -30 rlineto stroke
15 .5 z mul add 15 z 2 div sub moveto -30 -30 rlineto stroke
15 1.5 z mul add 15 z 2 div sub moveto -30 -30 rlineto stroke
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z neg 0 100 91 135 arc -30 -30 rlineto stroke
0 0 100 91 135 arc -30 -30 rlineto stroke
z neg z neg 100 271 315 arc 30 30 rlineto stroke
z 0 100 91 135 arc -30 -30 rlineto stroke
z z neg 100 271 315 arc 30 30 rlineto stroke
z 2 mul neg z neg 100 271 315 arc 30 30 rlineto stroke
z 2 mul 0 100 91 135 arc -30 -30 rlineto stroke
z 1.5 mul neg z .5 mul 100 196 225 arc 30 -30 rlineto stroke
z 1.5 mul z .5 mul neg 100 16 45 arc -30 30 rlineto stroke
z 1.5 mul neg z .5 mul neg 100 181 225 arc 30 -30 rlineto stroke
z 1.5 mul z 1.5 mul neg 100 1 45 arc -30 30 rlineto stroke
grestore
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-16 z sub 16 z sub moveto 32 -32 rlineto stroke
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16 .5 z mul sub 16 z 2 div sub moveto -32 -32 rlineto stroke
16 .5 z mul add 16 z 2 div sub moveto -32 -32 rlineto stroke
16 1.5 z mul add 16 z 2 div sub moveto -32 -32 rlineto stroke
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z 0 100 90 135 arc -31 -31 rlineto stroke
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z 1.5 mul z 1.5 mul neg 100 0 45 arc -31 31 rlineto stroke
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